Login

A login is a set of credentials used to authenticate a user. Most often, these consist of a username and password. However, a login may include other information, such as a PIN number, passcode, or passphrase. Some logins require a biometric identifier, such as a fingerprint or retina scan.

Logins are used by websites, computer applications, and mobile apps. They are a security measure designed to prevent unauthorized access to confidential data. When a login fails (i.e, the username and password combination does not match a user account), the user is disallowed access. Many systems block users from even trying to log in after multiple failed login attempts.

Examples of logins include:

Operating system login – Windows and Mac systems can be configured to require a login in order to use the computer after it is turned on or woken from sleep mode. A login may also be required to install software or modify system files.

Website login – Webmail interfaces, financial websites, and many other sites require a username and password in order to access account information.

At a basic level, logins make user accounts possible. Most systems require unique usernames, which ensures every user's login is different. On a more advanced level, logins provide a security layer between unsecured and secure activity. Once a user logs in to a secure website, for example, all data transfers are typically encrypted. This prevents other systems from viewing or recording the data transferred from the server.

NOTE: Login is technically a noun, not a verb. To enter a username and password is to "log in," "sign in," or "log on" (two words).

TechTerms - The Tech Terms Computer Dictionary

This page contains a technical definiton of Login. It explains in computing terminology what Login means and is one of many technical terms in the TechTerms dictionary.

All definitions on the TechTerms website are written to be technically accurate but also easy to understand. If you find this Login definition to be helpful, you can reference it using the citation links above. If you think a term should be updated or added to the TechTerms dictionary, please email TechTerms!